Add a zig wasm function.

Signed-off-by: jmug <u.g.a.mariano@gmail.com>

.gitignore

@@ -1,6 +1,6 @@
 # Envrc
 .direnv
-
+.zig-cache
 # ---> Go
 # If you prefer the allow list template instead of the deny list, see community template:
 # https://github.com/github/gitignore/blob/main/community/Golang/Go.AllowList.gitignore

flake.lock

@@ -36,10 +36,27 @@
         "type": "github"
       }
     },
+    "nixpkgszig": {
+      "locked": {
+        "lastModified": 1744502386,
+        "narHash": "sha256-QAd1L37eU7ktL2WeLLLTmI6P9moz9+a/ONO8qNBYJgM=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "f6db44a8daa59c40ae41ba6e5823ec77fe0d2124",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "f6db44a8daa59c40ae41ba6e5823ec77fe0d2124",
+        "type": "github"
+      }
+    },
     "root": {
       "inputs": {
         "flake-utils": "flake-utils",
         "nixpkgs": "nixpkgs",
+        "nixpkgszig": "nixpkgszig",
         "systems": "systems"
       }
     },

flake.nix

@@ -2,6 +2,7 @@
   description = "A dev shell flake for go";
   inputs = {
     nixpkgs.url = "github:NixOS/nixpkgs/de0fe301211c267807afd11b12613f5511ff7433"; # Go 1.24.1
+    nixpkgszig.url = "github:NixOS/nixpkgs/f6db44a8daa59c40ae41ba6e5823ec77fe0d2124"; # Zig 0.14.0
     systems.url = "github:nix-systems/default";
     flake-utils = {
       url = "github:numtide/flake-utils";
@@ -10,11 +11,12 @@
   };
 
   outputs =
-    { nixpkgs, flake-utils, ... }:
+    { nixpkgs, nixpkgszig, flake-utils, ... }:
     flake-utils.lib.eachDefaultSystem (
       system:
       let
         pkgs = nixpkgs.legacyPackages.${system};
+        pkgszig = nixpkgszig.legacyPackages.${system};
       in
       {
         devShells.default = pkgs.mkShell {
@@ -22,6 +24,8 @@
             go
             gotools
             gopls
+            pkgszig.zig
+            pkgszig.zls
           ];
         };
       }

go.mod

@@ -0,0 +1,3 @@
+module code.jmug.me/jmug/sqlite-wasm
+
+go 1.23.6

testdata/addupto.zig

@@ -0,0 +1,15 @@
+const expect = @import("std").testing.expect;
+
+pub export fn addUpTo(to: u32) u32 {
+    var res: u32 = 0;
+    for (0..to) |i| {
+        res += @intCast(i);
+    }
+    return res;
+}
+
+test "addUpTo" {
+    const expected: u32 = 15;
+    const actual = addUpTo(6);
+    try expect(actual == expected);
+}

testdata/build.zig

@@ -0,0 +1,39 @@
+const std = @import("std");
+const CrossTarget = std.zig.CrossTarget;
+
+pub fn build(b: *std.Build) void {
+    const nativeTarget = b.standardTargetOptions(.{});
+    const wasmTarget = b.resolveTargetQuery(.{
+        .cpu_arch = .wasm32,
+        .os_tag = .freestanding,
+    });
+
+    const add_up_to_mod = b.createModule(.{
+        .root_source_file = b.path("addupto.zig"),
+        .target = wasmTarget,
+        .optimize = b.standardOptimizeOption(.{}),
+    });
+    const add_up_to_native_mod = b.createModule(.{
+        .root_source_file = b.path("addupto.zig"),
+        .target = nativeTarget,
+    });
+
+    const add_up_to = b.addExecutable(.{
+        .name = "addUpTo",
+        .root_module = add_up_to_mod,
+    });
+    add_up_to.entry = .disabled;
+    add_up_to.rdynamic = true;
+    b.installArtifact(add_up_to);
+
+    const add_up_to_uts = b.addTest(.{
+        .root_module = add_up_to_native_mod,
+    });
+    const run_add_up_to_uts = b.addRunArtifact(add_up_to_uts);
+
+    // Similar to creating the run step earlier, this exposes a `test` step to
+    // the `zig build --help` menu, providing a way for the user to request
+    // running the unit tests.
+    const test_step = b.step("test", "Run unit tests");
+    test_step.dependOn(&run_add_up_to_uts.step);
+}